Understanding 30F Bra Size
A 30F bra size is considered a small band size with an extra large cup size. This size is perfect for people with a petite frame and extra large breast volume. Let's explore what makes this size unique and how to find the perfect fit.
Is 30F considered big or small?
Fast facts about 30F
- Snug 30 band with a 7-inch cup jump.
- Standing bust around 36.5–37.5 in keeps the cup filled.
- Share cup volume with 28G, 32E for band tweaks.
- Always scoop-and-swoop and check the gore for a flat anchor.
How 30F is measured
Band fit
Aim for a snug 28.5–29.5 in underbust so the 30 band stays level without digging.
Cup depth
Standing bust in the 36.5–37.5 in range keeps roughly a 7-inch cup difference.
Support focus
Choose firm wings, fully adjustable straps, and swap sister sizes if the band shifts during wear.
30F bust size in inches
| Measurement | Typical inches | How to capture it |
|---|---|---|
| Snug band (ribcage) | 28.5–29.5 in | Measure firmly under the bust on an exhale, then round to the band label. |
| Standing bust | 36.5–37.5 in | Keep the tape level across the fullest point while standing tall. |
| Band-to-bust difference | ≈7 in | Subtract your snug band from the standing bust to confirm cup depth. |
| Approx. cup depth | 8.5–9.5 in | Measure from the underwire root to the apex on a well-fitting bra. |
30F bust size in centimeters
| Measurement | Typical cm | How to capture it |
|---|---|---|
| Snug band (ribcage) | 72.4–74.9 cm | Measure firmly beneath the bust, then map it to EU/FR/JP band labels. |
| Standing bust | 92.7–95.3 cm | Keep the tape level across the fullest point without compressing tissue. |
| Band-to-bust difference | ≈17.8 cm | Use the difference to double-check your metric cup depth. |
| Approx. cup depth | 21.6–24.1 cm | Trace from underbust to apex on a supportive bra to check projection. |
- Sits below the most common band range of 32-36, so the cups rest on a petite frame.
- Extends beyond the sizing most stores stock, so it often looks full even on wider bands.
- Monitor posture and band tension—small shifts change how the size looks.
- Try sister sizes 28G, 32E to fine-tune band tension.
Quick reference for 30F
- 30F ≈ band 30 label with a 7-inch cup step.
- Projected bust lands around 36.5–37.5 in.
- Use the calculator to convert this size across US/UK/EU/JP systems.
Ranges are approximations—double-check your own measurements for precision.
30F across popular sizing systems
Match US 30F to the most searched regional labels without leaving this guide.
Currently showing the United States (US) label — copy 30F to match tags instantly.
United States (US)
30F
United Kingdom (UK)
30E
Europe (EU)
65G
France (FR)
80G
Japan (JP)
70G
Australia (AU)
8F
Quick converter
Switch systems and copy the exact label for checkout forms or bra tags.
Need step-by-step help? Jump into the dedicated guides below for measurement nuances and shopping tips.
Perfect For
- Petite frames
- Smaller ribcages
- Extra large breast volume
- Advanced support needs
Recommended Styles
T-Shirt Bras
Perfect for everyday wear under fitted clothing
- Seamless
- Molded cups
- Comfortable
Balconette Bras
Great for creating a natural lift and shape
- Wide-set straps
- Lower cut cups
- Enhancing
Plunge Bras
Ideal for low-cut tops and dresses
- Deep V-neck
- Minimal coverage
- Versatile
How 30F tends to look
30F pairs a 30-band with a 7-inch cup jump, so the silhouette changes with your frame and bra style.
- Keep 28G, 32E in mind—they share cup volume while tweaking the band.
- Shape, strap placement, and fabric choice all influence whether the size looks subtle or bold.
30F compared with nearby sizes
Quick reference when you’re deciding whether to change the band, the cup, or both.
- 30E is one cup shallower—switch when 30F wrinkles along the neckline.
- 30G adds depth while keeping the band snug if you spill out of 30F.
- 28G / 32E keep the same cup volume but tweak band tightness for comfort.
Sister size playbook
- Try 28G when you need tighter or looser band support.
- Try 32E when you need tighter or looser band support.
Fit checks before you buy
When trying on 30F bras, look for these key fit indicators:
- The band should fit snugly around your ribcage
- Cups should fully contain your breasts without spillage
- Straps should stay in place without digging in
- The center gore should lie flat against your chest
- Keep the band parallel to the floor on the middle hook.
- Scoop and swoop tissue into the cups before checking the gore.
- Adjust straps for lift, then reassess comfort after an hour of wear.
Remember that fit can vary between brands and styles. Always try on bras before purchasing to ensure the perfect fit.
Common 30F questions
What size is 30F in other systems?
30F converts to 30E in UK sizes, 65G in EU, 80G in FR, 70G in JP, and 8F in AU.
What does 30F mean?
30F pairs a 30 band with a cup that is roughly 7 inches deeper than the band measurement.
Which sister sizes match 30F?
30F shares cup volume with 28G, 32E. Use them to tighten or relax the band.
How can I confirm this is my best fit?
Measure snug and standing bust, check for smooth cup edges, and ensure the band stays level after a few minutes of wear.
Check 30F with our tools
Measure with the calculator, compare sister sizes, and review the perception guide for styling tips.